With official Firefox 4.0 beta1: Drag down feedback button, and select all your studies. Make the window bigger in height. Screenshot at: http://img266.imageshack.us/img266/8492/testpilot.png (stole from the comment at http://mozillalabs.com/testpilot/2010/06/07/test-pilot-1-0-beta-released/ 4 weeks ago.) I saw this bug on Linux and OpenSolaris. On Solaris 10, the default size of the window is bigger, the problem is more obvious to users. I didn't try it on Windows. On Mac OS X, the window is not resizable, so I didn't recreate the problem.